A NEW FOSSIL LONGICORN BEETLE. 177 



Ergates atavellus, n. sp. 

 Length about 25 mm.; entirely piceous ; width of head 6 mm., 

 •of prothorax 8 mm., length of prothorax nearly 4 mm., its sides 

 hardly convex in profile, exceedingly minutely and briefly denticulate, 

 the only clearly visible denticles being a couple above the anterior 

 femora, not far apart, but there are faint indications of others; 

 antenniferous tubercles large and prominent ; antennal joints 

 measuring in mm. (1) 3-7, (2) -5, (3) 4-9, (4) 4-5, (5) 4, (6) 4, (7) 3-5, 

 (8) 3-5, (9) 3-5 ; anterior tibiae 5 mm. long ; elytra 16-5 mm. long and 

 •5 wide. 



Labelled " Prionus, Upper Molasse, (Eningen (Whidborne Col- 

 lection)." It is on a slab with about nine Planorbis declivis, 

 A. Br. 



It agrees with Ergates in form, in antennae, etc., but differs 

 by the almost obsolete denticulation of sides of prothorax, and 

 smaller sizes. 



From the American E. (Trichocnemis) spiculatus, Lee, it 

 differs by the much shorter third antennal joint, which is about 

 equal to the fourth ; in spiculatas the third is about 10 mm. and 

 the fourth 3*5 mm. It also seems to lack the distinct ridges on 

 the elytra, or they are very obscure. The elytra also are broadly 

 rounded at the end, without a denticle at the inner corner, so 

 far as can he seen. 



In the European E.faber (L.), the characters are much more 

 like those of the fossil, both as to elytra and thorax, but in that 

 also the third antennal joint is much longer than the fourth. 



Heer figured from (Eningen two species of Ergates, under the 

 generic name Prionus. They are said to have no teeth or serra- 

 tions at the sides of the thorax. 



E. polyphemus (Heer) is said to be very like E. faber, and is 

 of the same size. The elytra are 33'5 mm. long, and the third 

 antennal joint is about twice as long as the fourth. 



E. spectabilis (Heer) has the elytra 22 mm. long and 5*3 

 wide, with very distinct longitudinal ridges as in E. spiculatus. 

 The thorax is considerably narrower than in our fossil. The 

 antenna?, are poorly drawn, but the third joint is considerably 

 longer than fourth, and the antennae are less attenuate than 

 in ours. 



Scudder in 1895 reported a Prionus, n. sp., from (Eningen, 

 but gave neither description nor name. 



The genus Ergates is to-day represented by few species, 

 placed in three different subgenera. It appears to represent the 

 remnants of a formerly more extensive group. The related 

 genus Callipogon is neotropical. 



I also found in the collection, from (Eningen, three specimens 

 of Anoplitis bremii, Heer. The genus Anopliti* is American. 

 and I think Heer's fossil is not congeneric, but falls better in the 



